JRuby support

[anildigital]

Does it support JRuby? I ran example with JRuby 1.6.4. It gives me

LoadError: load error: cool.io_ext -- java.lang.UnsatisfiedLinkError: Could not locate Init_cool.io_ext module entry point

[tarcieri]

No JRuby support at the moment, unfortunately :(

I've been thinking a lot about trying to add it on Netty or NIO, we'll see.

I don't have any plans to get it working via C extension at the moment.

[kyledrake]

It would be awesome to be able to use Netty/NIO for this!

[semarco]

+1 jruby support would be awesome and would help msgpack-rpc to run on jruby too :-)

[tarcieri]

A little bit of movement in this direction:

https://github.com/tarcieri/nio4r

This is a cross-Ruby NIO implementation that uses native Java NIO on JRuby and libev on other platforms. It could be used to replace the current cool.io C extension

[kyledrake]

How much work would it entail to implement this with cool.io? What does the current cool.io C extension do that nio4r cannot? I would love to see this happen.

I'd love to work on this, but my knowledge in C is a little rusty.

[tarcieri]

Believe it or not the overwhelming majority of the work would be in Ruby, rewriting Cool.io's guts to use nio4r in lieu of the present C extension.

The things that are missing from nio4r at the moment:

• stability: nio4r is brand new and hasn't seen production use whereas cool.io has
• timers: nio4r does not provide a timer system (though this could be done in pure Ruby. Celluloid has one)
• filesystem monitoring: nio4r does not (but could) provide a filesystem monitoring API that uses NIO2 on JRuby

[repeatedly]

We will start JRuby support on another issue.